For anyone just rolling up quite sure these are all gone, may have missed one or two but tried the vast majority of the non striked. Game looks interesting though may give it a try some time soon and thanks for codes OP.

I've looked into this more now and this is extremely close to what I want to do. The difference being that the packages I've found "exact match" to another group of respondents. Whereas I don't care about the exact make up of the respondents themselves, only the overall groups. I thought subclass matching was close to what I want but struggling there too. Any recommendations very welcome but thanks for getting me closer regardless.